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Chemical where used because they  were very effective to soldiers without gas mask not being invented it had done so much deaths because of the invention of poisonous gas

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How? (How was it used?  How deadly was it?)

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How? (How was it used?  How deadly was it?)

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Their were different gases used in the war some were used to just to incapacitate the enemy  not designed to kill for example tear gas.Some gases were deadly for example Chlorine was deadly in the  battle for solders it rained havoc  in the attack at Ypres 1,100 soldiers dead not wearing ga masked were killed because of the gas.

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What was the impact and /or effects of yours weapon on WWI, a particular battle or on history in general 

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What was the impact and /or effects of yours weapon on WWI, a particular battle or on history in general 

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In battle poison was very effective against soldiers with out gas masks. In some situations if a solider didn't have  gas mask it meant certain death from a breath of gas rarely some soldiers survived.

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The chemical weapons were used at  World War I in which they used it for more 125,000 tons of chemical weapons.

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The United States first used the chemical weapons against the Germans in 1918.

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The United States of America created the chemical weapons. They created them so that they can use it against the Germans.